Paul Edwards, How to Rap: The Art and Science of the Hip-Hop MC (2009)
Edwards' book is a compendium of interviews with the most influential hip-hop artists of all time, including Eminem. It delves into the technical details of their craft, but Edwards offsets the book's highly technical discussions of rhetoric and linguistics with plainspoken quotes from the artists describing how rhymes are generated, delivered, and transformed into songs and albums.
Eminem, The Way I Am (2008)
The Way I Am is Eminem's personal account of his rise to fame and a commentary on his writing process. The book is written in a conversational style to keep the personal appeal Eminem infuses his songs with, but the book is less forthcoming about his personal relationships with his ex-wife and mother, which have been highly controversial over the years.